/** vim: et:ts=4:sw=4:sts=4
 * @license RequireJS 2.3.2 Copyright jQuery Foundation and other contributors.
 * Released under MIT license, https://github.com/requirejs/requirejs/blob/master/LICENSE
 */
// Not using strict: uneven strict support in browsers, #392, and causes
// problems with requirejs.exec()/transpiler plugins that may not be strict.
/* jslint regexp: true, nomen: true, sloppy: true */
/* global window, navigator, document, importScripts, setTimeout, opera */

let requirejs,
  require,
  define;
(function (global, setTimeout) {
  let req,
    s,
    head,
    baseElement,
    dataMain,
    src,
    interactiveScript,
    currentlyAddingScript,
    mainScript,
    subPath,
    version = '2.3.2',
    commentRegExp = /\/\*[\s\S]*?\*\/|([^:"'=]|^)\/\/.*$/mg,
    cjsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g,
    jsSuffixRegExp = /\.js$/,
    currDirRegExp = /^\.\//,
    op = Object.prototype,
    ostring = op.toString,
    hasOwn = op.hasOwnProperty,
    isBrowser = !!(typeof window !== 'undefined' && typeof navigator !== 'undefined' && window.document),
    isWebWorker = !isBrowser && typeof importScripts !== 'undefined',
        // PS3 indicates loaded and complete, but need to wait for complete
        // specifically. Sequence is 'loading', 'loaded', execution,
        // then 'complete'. The UA check is unfortunate, but not sure how
        // to feature test w/o causing perf issues.
    readyRegExp = isBrowser && navigator.platform === 'PLAYSTATION 3' ?
                      /^complete$/ : /^(complete|loaded)$/,
    defContextName = '_',
        // Oh the tragedy, detecting opera. See the usage of isOpera for reason.
    isOpera = typeof opera !== 'undefined' && opera.toString() === '[object Opera]',
    contexts = {},
    cfg = {},
    globalDefQueue = [],
    useInteractive = false

    // Could match something like ')//comment', do not lose the prefix to comment.
  function commentReplace(match, singlePrefix) {
    return singlePrefix || ''
  }

  function isFunction(it) {
    return ostring.call(it) === '[object Function]'
  }

  function isArray(it) {
    return ostring.call(it) === '[object Array]'
  }

    /**
     * Helper function for iterating over an array. If the func returns
     * a true value, it will break out of the loop.
     */
  function each(ary, func) {
    if (ary) {
      let i
      for (i = 0; i < ary.length; i += 1) {
        if (ary[i] && func(ary[i], i, ary)) {
          break
        }
      }
    }
  }

    /**
     * Helper function for iterating over an array backwards. If the func
     * returns a true value, it will break out of the loop.
     */
  function eachReverse(ary, func) {
    if (ary) {
      let i
      for (i = ary.length - 1; i > -1; i -= 1) {
        if (ary[i] && func(ary[i], i, ary)) {
          break
        }
      }
    }
  }

  function hasProp(obj, prop) {
    return hasOwn.call(obj, prop)
  }

  function getOwn(obj, prop) {
    return hasProp(obj, prop) && obj[prop]
  }

    /**
     * Cycles over properties in an object and calls a function for each
     * property value. If the function returns a truthy value, then the
     * iteration is stopped.
     */
  function eachProp(obj, func) {
    let prop
    for (prop in obj) {
      if (hasProp(obj, prop)) {
        if (func(obj[prop], prop)) {
          break
        }
      }
    }
  }

    /**
     * Simple function to mix in properties from source into target,
     * but only if target does not already have a property of the same name.
     */
  function mixin(target, source, force, deepStringMixin) {
    if (source) {
      eachProp(source, (value, prop) => {
        if (force || !hasProp(target, prop)) {
          if (deepStringMixin && typeof value === 'object' && value &&
                        !isArray(value) && !isFunction(value) &&
                        !(value instanceof RegExp)) {
            if (!target[prop]) {
              target[prop] = {}
            }
            mixin(target[prop], value, force, deepStringMixin)
          } else {
            target[prop] = value
          }
        }
      })
    }
    return target
  }

    // Similar to Function.prototype.bind, but the 'this' object is specified
    // first, since it is easier to read/figure out what 'this' will be.
  function bind(obj, fn) {
    return function () {
      return fn.apply(obj, arguments)
    }
  }

  function scripts() {
    return document.getElementsByTagName('script')
  }

  function defaultOnError(err) {
    throw err
  }

    // Allow getting a global that is expressed in
    // dot notation, like 'a.b.c'.
  function getGlobal(value) {
    if (!value) {
      return value
    }
    let g = global
    each(value.split('.'), (part) => {
      g = g[part]
    })
    return g
  }

    /**
     * Constructs an error with a pointer to an URL with more information.
     * @param {String} id the error ID that maps to an ID on a web page.
     * @param {String} message human readable error.
     * @param {Error} [err] the original error, if there is one.
     *
     * @returns {Error}
     */
  function makeError(id, msg, err, requireModules) {
    const e = new Error(`${msg}\nhttp://requirejs.org/docs/errors.html#${id}`)
    e.requireType = id
    e.requireModules = requireModules
    if (err) {
      e.originalError = err
    }
    return e
  }

  if (typeof define !== 'undefined') {
        // If a define is already in play via another AMD loader,
        // do not overwrite.
    return
  }

  if (typeof requirejs !== 'undefined') {
    if (isFunction(requirejs)) {
            // Do not overwrite an existing requirejs instance.
      return
    }
    cfg = requirejs
    requirejs = undefined
  }

    // Allow for a require config object
  if (typeof require !== 'undefined' && !isFunction(require)) {
        // assume it is a config object.
    cfg = require
    require = undefined
  }

  function newContext(contextName) {
    let inCheckLoaded,
      Module,
      context,
      handlers,
      checkLoadedTimeoutId,
      config = {
                // Defaults. Do not set a default for map
                // config to speed up normalize(), which
                // will run faster if there is no default.
        waitSeconds: 7,
        baseUrl: './',
        paths: {},
        bundles: {},
        pkgs: {},
        shim: {},
        config: {},
      },
      registry = {},
            // registry of just enabled modules, to speed
            // cycle breaking code when lots of modules
            // are registered, but not activated.
      enabledRegistry = {},
      undefEvents = {},
      defQueue = [],
      defined = {},
      urlFetched = {},
      bundlesMap = {},
      requireCounter = 1,
      unnormalizedCounter = 1

        /**
         * Trims the . and .. from an array of path segments.
         * It will keep a leading path segment if a .. will become
         * the first path segment, to help with module name lookups,
         * which act like paths, but can be remapped. But the end result,
         * all paths that use this function should look normalized.
         * NOTE: this method MODIFIES the input array.
         * @param {Array} ary the array of path segments.
         */
    function trimDots(ary) {
      let i,
        part
      for (i = 0; i < ary.length; i++) {
        part = ary[i]
        if (part === '.') {
          ary.splice(i, 1)
          i -= 1
        } else if (part === '..') {
                    // If at the start, or previous value is still ..,
                    // keep them so that when converted to a path it may
                    // still work when converted to a path, even though
                    // as an ID it is less than ideal. In larger point
                    // releases, may be better to just kick out an error.
          if (i === 0 || (i === 1 && ary[2] === '..') || ary[i - 1] === '..') {
            continue
          } else if (i > 0) {
            ary.splice(i - 1, 2)
            i -= 2
          }
        }
      }
    }

        /**
         * Given a relative module name, like ./something, normalize it to
         * a real name that can be mapped to a path.
         * @param {String} name the relative name
         * @param {String} baseName a real name that the name arg is relative
         * to.
         * @param {Boolean} applyMap apply the map config to the value. Should
         * only be done if this normalization is for a dependency ID.
         * @returns {String} normalized name
         */
    function normalize(name, baseName, applyMap) {
      let pkgMain,
        mapValue,
        nameParts,
        i,
        j,
        nameSegment,
        lastIndex,
        foundMap,
        foundI,
        foundStarMap,
        starI,
        normalizedBaseParts,
        baseParts = (baseName && baseName.split('/')),
        map = config.map,
        starMap = map && map['*']

            // Adjust any relative paths.
      if (name) {
        name = name.split('/')
        lastIndex = name.length - 1

                // If wanting node ID compatibility, strip .js from end
                // of IDs. Have to do this here, and not in nameToUrl
                // because node allows either .js or non .js to map
                // to same file.
        if (config.nodeIdCompat && jsSuffixRegExp.test(name[lastIndex])) {
          name[lastIndex] = name[lastIndex].replace(jsSuffixRegExp, '')
        }

                // Starts with a '.' so need the baseName
        if (name[0].charAt(0) === '.' && baseParts) {
                    // Convert baseName to array, and lop off the last part,
                    // so that . matches that 'directory' and not name of the baseName's
                    // module. For instance, baseName of 'one/two/three', maps to
                    // 'one/two/three.js', but we want the directory, 'one/two' for
                    // this normalization.
          normalizedBaseParts = baseParts.slice(0, baseParts.length - 1)
          name = normalizedBaseParts.concat(name)
        }

        trimDots(name)
        name = name.join('/')
      }

            // Apply map config if available.
      if (applyMap && map && (baseParts || starMap)) {
        nameParts = name.split('/')

        outerLoop: for (i = nameParts.length; i > 0; i -= 1) {
          nameSegment = nameParts.slice(0, i).join('/')

          if (baseParts) {
                        // Find the longest baseName segment match in the config.
                        // So, do joins on the biggest to smallest lengths of baseParts.
            for (j = baseParts.length; j > 0; j -= 1) {
              mapValue = getOwn(map, baseParts.slice(0, j).join('/'))

                            // baseName segment has config, find if it has one for
                            // this name.
              if (mapValue) {
                mapValue = getOwn(mapValue, nameSegment)
                if (mapValue) {
                                    // Match, update name to the new value.
                  foundMap = mapValue
                  foundI = i
                  break outerLoop
                }
              }
            }
          }

                    // Check for a star map match, but just hold on to it,
                    // if there is a shorter segment match later in a matching
                    // config, then favor over this star map.
          if (!foundStarMap && starMap && getOwn(starMap, nameSegment)) {
            foundStarMap = getOwn(starMap, nameSegment)
            starI = i
          }
        }

        if (!foundMap && foundStarMap) {
          foundMap = foundStarMap
          foundI = starI
        }

        if (foundMap) {
          nameParts.splice(0, foundI, foundMap)
          name = nameParts.join('/')
        }
      }

            // If the name points to a package's name, use
            // the package main instead.
      pkgMain = getOwn(config.pkgs, name)

      return pkgMain ? pkgMain : name
    }

    function removeScript(name) {
      if (isBrowser) {
        each(scripts(), (scriptNode) => {
          if (scriptNode.getAttribute('data-requiremodule') === name &&
                            scriptNode.getAttribute('data-requirecontext') === context.contextName) {
            scriptNode.parentNode.removeChild(scriptNode)
            return true
          }
        })
      }
    }

    function hasPathFallback(id) {
      const pathConfig = getOwn(config.paths, id)
      if (pathConfig && isArray(pathConfig) && pathConfig.length > 1) {
                // Pop off the first array value, since it failed, and
                // retry
        pathConfig.shift()
        context.require.undef(id)

                // Custom require that does not do map translation, since
                // ID is "absolute", already mapped/resolved.
        context.makeRequire(null, {
          skipMap: true,
        })([id])

        return true
      }
    }

        // Turns a plugin!resource to [plugin, resource]
        // with the plugin being undefined if the name
        // did not have a plugin prefix.
    function splitPrefix(name) {
      let prefix,
        index = name ? name.indexOf('!') : -1
      if (index > -1) {
        prefix = name.substring(0, index)
        name = name.substring(index + 1, name.length)
      }
      return [prefix, name]
    }

        /**
         * Creates a module mapping that includes plugin prefix, module
         * name, and path. If parentModuleMap is provided it will
         * also normalize the name via require.normalize()
         *
         * @param {String} name the module name
         * @param {String} [parentModuleMap] parent module map
         * for the module name, used to resolve relative names.
         * @param {Boolean} isNormalized: is the ID already normalized.
         * This is true if this call is done for a define() module ID.
         * @param {Boolean} applyMap: apply the map config to the ID.
         * Should only be true if this map is for a dependency.
         *
         * @returns {Object}
         */
    function makeModuleMap(name, parentModuleMap, isNormalized, applyMap) {
      let url,
        pluginModule,
        suffix,
        nameParts,
        prefix = null,
        parentName = parentModuleMap ? parentModuleMap.name : null,
        originalName = name,
        isDefine = true,
        normalizedName = ''

            // If no name, then it means it is a require call, generate an
            // internal name.
      if (!name) {
        isDefine = false
        name = `_@r${requireCounter += 1}`
      }

      nameParts = splitPrefix(name)
      prefix = nameParts[0]
      name = nameParts[1]

      if (prefix) {
        prefix = normalize(prefix, parentName, applyMap)
        pluginModule = getOwn(defined, prefix)
      }

            // Account for relative paths if there is a base name.
      if (name) {
        if (prefix) {
          if (pluginModule && pluginModule.normalize) {
                        // Plugin is loaded, use its normalize method.
            normalizedName = pluginModule.normalize(name, (name) => {
              return normalize(name, parentName, applyMap)
            })
          } else {
                        // If nested plugin references, then do not try to
                        // normalize, as it will not normalize correctly. This
                        // places a restriction on resourceIds, and the longer
                        // term solution is not to normalize until plugins are
                        // loaded and all normalizations to allow for async
                        // loading of a loader plugin. But for now, fixes the
                        // common uses. Details in #1131
            normalizedName = name.indexOf('!') === -1 ?
                                         normalize(name, parentName, applyMap) :
                                         name
          }
        } else {
                    // A regular module.
          normalizedName = normalize(name, parentName, applyMap)

                    // Normalized name may be a plugin ID due to map config
                    // application in normalize. The map config values must
                    // already be normalized, so do not need to redo that part.
          nameParts = splitPrefix(normalizedName)
          prefix = nameParts[0]
          normalizedName = nameParts[1]
          isNormalized = true

          url = context.nameToUrl(normalizedName)
        }
      }

            // If the id is a plugin id that cannot be determined if it needs
            // normalization, stamp it with a unique ID so two matching relative
            // ids that may conflict can be separate.
      suffix = prefix && !pluginModule && !isNormalized ?
                     `_unnormalized${unnormalizedCounter += 1}` :
                     ''

      return {
        prefix,
        name: normalizedName,
        parentMap: parentModuleMap,
        unnormalized: !!suffix,
        url,
        originalName,
        isDefine,
        id: (prefix ?
                        `${prefix}!${normalizedName}` :
                        normalizedName) + suffix,
      }
    }

    function getModule(depMap) {
      let id = depMap.id,
        mod = getOwn(registry, id)

      if (!mod) {
        mod = registry[id] = new context.Module(depMap)
      }

      return mod
    }

    function on(depMap, name, fn) {
      let id = depMap.id,
        mod = getOwn(registry, id)

      if (hasProp(defined, id) &&
                    (!mod || mod.defineEmitComplete)) {
        if (name === 'defined') {
          fn(defined[id])
        }
      } else {
        mod = getModule(depMap)
        if (mod.error && name === 'error') {
          fn(mod.error)
        } else {
          mod.on(name, fn)
        }
      }
    }

    function onError(err, errback) {
      let ids = err.requireModules,
        notified = false

      if (errback) {
        errback(err)
      } else {
        each(ids, (id) => {
          const mod = getOwn(registry, id)
          if (mod) {
                        // Set error on module, so it skips timeout checks.
            mod.error = err
            if (mod.events.error) {
              notified = true
              mod.emit('error', err)
            }
          }
        })

        if (!notified) {
          req.onError(err)
        }
      }
    }

        /**
         * Internal method to transfer globalQueue items to this context's
         * defQueue.
         */
    function takeGlobalQueue() {
            // Push all the globalDefQueue items into the context's defQueue
      if (globalDefQueue.length) {
        each(globalDefQueue, (queueItem) => {
          const id = queueItem[0]
          if (typeof id === 'string') {
            context.defQueueMap[id] = true
          }
          defQueue.push(queueItem)
        })
        globalDefQueue = []
      }
    }

    handlers = {
      require(mod) {
        if (mod.require) {
          return mod.require
        } else {
          return (mod.require = context.makeRequire(mod.map))
        }
      },
      exports(mod) {
        mod.usingExports = true
        if (mod.map.isDefine) {
          if (mod.exports) {
            return (defined[mod.map.id] = mod.exports)
          } else {
            return (mod.exports = defined[mod.map.id] = {})
          }
        }
      },
      module(mod) {
        if (mod.module) {
          return mod.module
        } else {
          return (mod.module = {
            id: mod.map.id,
            uri: mod.map.url,
            config() {
              return getOwn(config.config, mod.map.id) || {}
            },
            exports: mod.exports || (mod.exports = {}),
          })
        }
      },
    }

    function cleanRegistry(id) {
            // Clean up machinery used for waiting modules.
      delete registry[id]
      delete enabledRegistry[id]
    }

    function breakCycle(mod, traced, processed) {
      const id = mod.map.id

      if (mod.error) {
        mod.emit('error', mod.error)
      } else {
        traced[id] = true
        each(mod.depMaps, (depMap, i) => {
          let depId = depMap.id,
            dep = getOwn(registry, depId)

                    // Only force things that have not completed
                    // being defined, so still in the registry,
                    // and only if it has not been matched up
                    // in the module already.
          if (dep && !mod.depMatched[i] && !processed[depId]) {
            if (getOwn(traced, depId)) {
              mod.defineDep(i, defined[depId])
              mod.check() // pass false?
            } else {
              breakCycle(dep, traced, processed)
            }
          }
        })
        processed[id] = true
      }
    }

    function checkLoaded() {
      let err,
        usingPathFallback,
        waitInterval = config.waitSeconds * 1000,
                // It is possible to disable the wait interval by using waitSeconds of 0.
        expired = waitInterval && (context.startTime + waitInterval) < new Date().getTime(),
        noLoads = [],
        reqCalls = [],
        stillLoading = false,
        needCycleCheck = true

            // Do not bother if this call was a result of a cycle break.
      if (inCheckLoaded) {
        return
      }

      inCheckLoaded = true

            // Figure out the state of all the modules.
      eachProp(enabledRegistry, (mod) => {
        let map = mod.map,
          modId = map.id

                // Skip things that are not enabled or in error state.
        if (!mod.enabled) {
          return
        }

        if (!map.isDefine) {
          reqCalls.push(mod)
        }

        if (!mod.error) {
                    // If the module should be executed, and it has not
                    // been inited and time is up, remember it.
          if (!mod.inited && expired) {
            if (hasPathFallback(modId)) {
              usingPathFallback = true
              stillLoading = true
            } else {
              noLoads.push(modId)
              removeScript(modId)
            }
          } else if (!mod.inited && mod.fetched && map.isDefine) {
            stillLoading = true
            if (!map.prefix) {
                            // No reason to keep looking for unfinished
                            // loading. If the only stillLoading is a
                            // plugin resource though, keep going,
                            // because it may be that a plugin resource
                            // is waiting on a non-plugin cycle.
              return (needCycleCheck = false)
            }
          }
        }
      })

      if (expired && noLoads.length) {
                // If wait time expired, throw error of unloaded modules.
        err = makeError('timeout', `Load timeout for modules: ${noLoads}`, null, noLoads)
        err.contextName = context.contextName
        return onError(err)
      }

            // Not expired, check for a cycle.
      if (needCycleCheck) {
        each(reqCalls, (mod) => {
          breakCycle(mod, {}, {})
        })
      }

            // If still waiting on loads, and the waiting load is something
            // other than a plugin resource, or there are still outstanding
            // scripts, then just try back later.
      if ((!expired || usingPathFallback) && stillLoading) {
                // Something is still waiting to load. Wait for it, but only
                // if a timeout is not already in effect.
        if ((isBrowser || isWebWorker) && !checkLoadedTimeoutId) {
          checkLoadedTimeoutId = setTimeout(() => {
            checkLoadedTimeoutId = 0
            checkLoaded()
          }, 50)
        }
      }

      inCheckLoaded = false
    }

    Module = function (map) {
      this.events = getOwn(undefEvents, map.id) || {}
      this.map = map
      this.shim = getOwn(config.shim, map.id)
      this.depExports = []
      this.depMaps = []
      this.depMatched = []
      this.pluginMaps = {}
      this.depCount = 0

            /* this.exports this.factory
               this.depMaps = [],
               this.enabled, this.fetched
            */
    }

    Module.prototype = {
      init(depMaps, factory, errback, options) {
        options = options || {}

                // Do not do more inits if already done. Can happen if there
                // are multiple define calls for the same module. That is not
                // a normal, common case, but it is also not unexpected.
        if (this.inited) {
          return
        }

        this.factory = factory

        if (errback) {
                    // Register for errors on this module.
          this.on('error', errback)
        } else if (this.events.error) {
                    // If no errback already, but there are error listeners
                    // on this module, set up an errback to pass to the deps.
          errback = bind(this, function (err) {
            this.emit('error', err)
          })
        }

                // Do a copy of the dependency array, so that
                // source inputs are not modified. For example
                // "shim" deps are passed in here directly, and
                // doing a direct modification of the depMaps array
                // would affect that config.
        this.depMaps = depMaps && depMaps.slice(0)

        this.errback = errback

                // Indicate this module has be initialized
        this.inited = true

        this.ignore = options.ignore

                // Could have option to init this module in enabled mode,
                // or could have been previously marked as enabled. However,
                // the dependencies are not known until init is called. So
                // if enabled previously, now trigger dependencies as enabled.
        if (options.enabled || this.enabled) {
                    // Enable this module and dependencies.
                    // Will call this.check()
          this.enable()
        } else {
          this.check()
        }
      },

      defineDep(i, depExports) {
                // Because of cycles, defined callback for a given
                // export can be called more than once.
        if (!this.depMatched[i]) {
          this.depMatched[i] = true
          this.depCount -= 1
          this.depExports[i] = depExports
        }
      },

      fetch() {
        if (this.fetched) {
          return
        }
        this.fetched = true

        context.startTime = (new Date()).getTime()

        const map = this.map

                // If the manager is for a plugin managed resource,
                // ask the plugin to load it now.
        if (this.shim) {
          context.makeRequire(this.map, {
            enableBuildCallback: true,
          })(this.shim.deps || [], bind(this, function () {
            return map.prefix ? this.callPlugin() : this.load()
          }))
        } else {
                    // Regular dependency.
          return map.prefix ? this.callPlugin() : this.load()
        }
      },

      load() {
        const url = this.map.url

                // Regular dependency.
        if (!urlFetched[url]) {
          urlFetched[url] = true
          context.load(this.map.id, url)
        }
      },

            /**
             * Checks if the module is ready to define itself, and if so,
             * define it.
             */
      check() {
        if (!this.enabled || this.enabling) {
          return
        }

        let err,
          cjsModule,
          id = this.map.id,
          depExports = this.depExports,
          exports = this.exports,
          factory = this.factory

        if (!this.inited) {
                    // Only fetch if not already in the defQueue.
          if (!hasProp(context.defQueueMap, id)) {
            this.fetch()
          }
        } else if (this.error) {
          this.emit('error', this.error)
        } else if (!this.defining) {
                    // The factory could trigger another require call
                    // that would result in checking this module to
                    // define itself again. If already in the process
                    // of doing that, skip this work.
          this.defining = true

          if (this.depCount < 1 && !this.defined) {
            if (isFunction(factory)) {
                            // If there is an error listener, favor passing
                            // to that instead of throwing an error. However,
                            // only do it for define()'d  modules. require
                            // errbacks should not be called for failures in
                            // their callbacks (#699). However if a global
                            // onError is set, use that.
              if ((this.events.error && this.map.isDefine) ||
                                req.onError !== defaultOnError) {
                try {
                    exports = context.execCb(id, factory, depExports, exports)
                  } catch (e) {
                      err = e
                    }
              } else {
                exports = context.execCb(id, factory, depExports, exports)
              }

                            // Favor return value over exports. If node/cjs in play,
                            // then will not have a return value anyway. Favor
                            // module.exports assignment over exports object.
              if (this.map.isDefine && exports === undefined) {
                cjsModule = this.module
                if (cjsModule) {
                    exports = cjsModule.exports
                  } else if (this.usingExports) {
                                    // exports already set the defined value.
                      exports = this.exports
                    }
              }

              if (err) {
                err.requireMap = this.map
                err.requireModules = this.map.isDefine ? [this.map.id] : null
                err.requireType = this.map.isDefine ? 'define' : 'require'
                return onError((this.error = err))
              }
            } else {
                            // Just a literal value
              exports = factory
            }

            this.exports = exports

            if (this.map.isDefine && !this.ignore) {
              defined[id] = exports

              if (req.onResourceLoad) {
                const resLoadMaps = []
                each(this.depMaps, (depMap) => {
                    resLoadMaps.push(depMap.normalizedMap || depMap)
                  })
                req.onResourceLoad(context, this.map, resLoadMaps)
              }
            }

                        // Clean up
            cleanRegistry(id)

            this.defined = true
          }

                    // Finished the define stage. Allow calling check again
                    // to allow define notifications below in the case of a
                    // cycle.
          this.defining = false

          if (this.defined && !this.defineEmitted) {
            this.defineEmitted = true
            this.emit('defined', this.exports)
            this.defineEmitComplete = true
          }
        }
      },

      callPlugin() {
        let map = this.map,
          id = map.id,
                    // Map already normalized the prefix.
          pluginMap = makeModuleMap(map.prefix)

                // Mark this as a dependency for this plugin, so it
                // can be traced for cycles.
        this.depMaps.push(pluginMap)

        on(pluginMap, 'defined', bind(this, function (plugin) {
          let load,
            normalizedMap,
            normalizedMod,
            bundleId = getOwn(bundlesMap, this.map.id),
            name = this.map.name,
            parentName = this.map.parentMap ? this.map.parentMap.name : null,
            localRequire = context.makeRequire(map.parentMap, {
              enableBuildCallback: true,
            })

                    // If current map is not normalized, wait for that
                    // normalized name to load instead of continuing.
          if (this.map.unnormalized) {
                        // Normalize the ID if the plugin allows it.
            if (plugin.normalize) {
              name = plugin.normalize(name, (name) => {
                return normalize(name, parentName, true)
              }) || ''
            }

                        // prefix and name should already be normalized, no need
                        // for applying map config again either.
            normalizedMap = makeModuleMap(`${map.prefix}!${name}`,
                                                      this.map.parentMap)
            on(normalizedMap,
                            'defined', bind(this, function (value) {
                              this.map.normalizedMap = normalizedMap
                              this.init([], () => { return value }, null, {
                                enabled: true,
                                ignore: true,
                              })
                            }))

            normalizedMod = getOwn(registry, normalizedMap.id)
            if (normalizedMod) {
                            // Mark this as a dependency for this plugin, so it
                            // can be traced for cycles.
              this.depMaps.push(normalizedMap)

              if (this.events.error) {
                normalizedMod.on('error', bind(this, function (err) {
                  this.emit('error', err)
                }))
              }
              normalizedMod.enable()
            }

            return
          }

                    // If a paths config, then just load that file instead to
                    // resolve the plugin, as it is built into that paths layer.
          if (bundleId) {
            this.map.url = context.nameToUrl(bundleId)
            this.load()
            return
          }

          load = bind(this, function (value) {
            this.init([], () => { return value }, null, {
              enabled: true,
            })
          })

          load.error = bind(this, function (err) {
            this.inited = true
            this.error = err
            err.requireModules = [id]

                        // Remove temp unnormalized modules for this module,
                        // since they will never be resolved otherwise now.
            eachProp(registry, (mod) => {
              if (mod.map.id.indexOf(`${id}_unnormalized`) === 0) {
                cleanRegistry(mod.map.id)
              }
            })

            onError(err)
          })

                    // Allow plugins to load other code without having to know the
                    // context or how to 'complete' the load.
          load.fromText = bind(this, function (text, textAlt) {
                        /* jslint evil: true */
            let moduleName = map.name,
              moduleMap = makeModuleMap(moduleName),
              hasInteractive = useInteractive

                        // As of 2.1.0, support just passing the text, to reinforce
                        // fromText only being called once per resource. Still
                        // support old style of passing moduleName but discard
                        // that moduleName in favor of the internal ref.
            if (textAlt) {
              text = textAlt
            }

                        // Turn off interactive script matching for IE for any define
                        // calls in the text, then turn it back on at the end.
            if (hasInteractive) {
              useInteractive = false
            }

                        // Prime the system by creating a module instance for
                        // it.
            getModule(moduleMap)

                        // Transfer any config to this other module.
            if (hasProp(config.config, id)) {
              config.config[moduleName] = config.config[id]
            }

            try {
              req.exec(text)
            } catch (e) {
              return onError(makeError('fromtexteval',
                                             `fromText eval for ${id
                                            } failed: ${e}`,
                                             e,
                                             [id]))
            }

            if (hasInteractive) {
              useInteractive = true
            }

                        // Mark this as a dependency for the plugin
                        // resource
            this.depMaps.push(moduleMap)

                        // Support anonymous modules.
            context.completeLoad(moduleName)

                        // Bind the value of that module to the value for this
                        // resource ID.
            localRequire([moduleName], load)
          })

                    // Use parentName here since the plugin's name is not reliable,
                    // could be some weird string with no path that actually wants to
                    // reference the parentName's path.
          plugin.load(map.name, localRequire, load, config)
        }))

        context.enable(pluginMap, this)
        this.pluginMaps[pluginMap.id] = pluginMap
      },

      enable() {
        enabledRegistry[this.map.id] = this
        this.enabled = true

                // Set flag mentioning that the module is enabling,
                // so that immediate calls to the defined callbacks
                // for dependencies do not trigger inadvertent load
                // with the depCount still being zero.
        this.enabling = true

                // Enable each dependency
        each(this.depMaps, bind(this, function (depMap, i) {
          let id,
            mod,
            handler

          if (typeof depMap === 'string') {
                        // Dependency needs to be converted to a depMap
                        // and wired up to this module.
            depMap = makeModuleMap(depMap,
                                               (this.map.isDefine ? this.map : this.map.parentMap),
                                               false,
                                               !this.skipMap)
            this.depMaps[i] = depMap

            handler = getOwn(handlers, depMap.id)

            if (handler) {
              this.depExports[i] = handler(this)
              return
            }

            this.depCount += 1

            on(depMap, 'defined', bind(this, function (depExports) {
              if (this.undefed) {
                return
              }
              this.defineDep(i, depExports)
              this.check()
            }))

            if (this.errback) {
              on(depMap, 'error', bind(this, this.errback))
            } else if (this.events.error) {
                            // No direct errback on this module, but something
                            // else is listening for errors, so be sure to
                            // propagate the error correctly.
              on(depMap, 'error', bind(this, function (err) {
                this.emit('error', err)
              }))
            }
          }

          id = depMap.id
          mod = registry[id]

                    // Skip special modules like 'require', 'exports', 'module'
                    // Also, don't call enable if it is already enabled,
                    // important in circular dependency cases.
          if (!hasProp(handlers, id) && mod && !mod.enabled) {
            context.enable(depMap, this)
          }
        }))

                // Enable each plugin that is used in
                // a dependency
        eachProp(this.pluginMaps, bind(this, function (pluginMap) {
          const mod = getOwn(registry, pluginMap.id)
          if (mod && !mod.enabled) {
            context.enable(pluginMap, this)
          }
        }))

        this.enabling = false

        this.check()
      },

      on(name, cb) {
        let cbs = this.events[name]
        if (!cbs) {
          cbs = this.events[name] = []
        }
        cbs.push(cb)
      },

      emit(name, evt) {
        each(this.events[name], (cb) => {
          cb(evt)
        })
        if (name === 'error') {
                    // Now that the error handler was triggered, remove
                    // the listeners, since this broken Module instance
                    // can stay around for a while in the registry.
          delete this.events[name]
        }
      },
    }

    function callGetModule(args) {
            // Skip modules already defined.
      if (!hasProp(defined, args[0])) {
        getModule(makeModuleMap(args[0], null, true)).init(args[1], args[2])
      }
    }

    function removeListener(node, func, name, ieName) {
            // Favor detachEvent because of IE9
            // issue, see attachEvent/addEventListener comment elsewhere
            // in this file.
      if (node.detachEvent && !isOpera) {
                // Probably IE. If not it will throw an error, which will be
                // useful to know.
        if (ieName) {
          node.detachEvent(ieName, func)
        }
      } else {
        node.removeEventListener(name, func, false)
      }
    }

        /**
         * Given an event from a script node, get the requirejs info from it,
         * and then removes the event listeners on the node.
         * @param {Event} evt
         * @returns {Object}
         */
    function getScriptData(evt) {
            // Using currentTarget instead of target for Firefox 2.0's sake. Not
            // all old browsers will be supported, but this one was easy enough
            // to support and still makes sense.
      const node = evt.currentTarget || evt.srcElement

            // Remove the listeners once here.
      removeListener(node, context.onScriptLoad, 'load', 'onreadystatechange')
      removeListener(node, context.onScriptError, 'error')

      return {
        node,
        id: node && node.getAttribute('data-requiremodule'),
      }
    }

    function intakeDefines() {
      let args

            // Any defined modules in the global queue, intake them now.
      takeGlobalQueue()

            // Make sure any remaining defQueue items get properly processed.
      while (defQueue.length) {
        args = defQueue.shift()
        if (args[0] === null) {
          return onError(makeError('mismatch', `Mismatched anonymous define() module: ${
                        args[args.length - 1]}`))
        } else {
                    // args are id, deps, factory. Should be normalized by the
                    // define() function.
          callGetModule(args)
        }
      }
      context.defQueueMap = {}
    }

    context = {
      config,
      contextName,
      registry,
      defined,
      urlFetched,
      defQueue,
      defQueueMap: {},
      Module,
      makeModuleMap,
      nextTick: req.nextTick,
      onError,

            /**
             * Set a configuration for the context.
             * @param {Object} cfg config object to integrate.
             */
      configure(cfg) {
                // Make sure the baseUrl ends in a slash.
        if (cfg.baseUrl) {
          if (cfg.baseUrl.charAt(cfg.baseUrl.length - 1) !== '/') {
            cfg.baseUrl += '/'
          }
        }

                // Convert old style urlArgs string to a function.
        if (typeof cfg.urlArgs === 'string') {
          const urlArgs = cfg.urlArgs
          cfg.urlArgs = function (id, url) {
            return (url.indexOf('?') === -1 ? '?' : '&') + urlArgs
          }
        }

                // Save off the paths since they require special processing,
                // they are additive.
        let shim = config.shim,
          objs = {
            paths: true,
            bundles: true,
            config: true,
            map: true,
          }

        eachProp(cfg, (value, prop) => {
          if (objs[prop]) {
            if (!config[prop]) {
              config[prop] = {}
            }
            mixin(config[prop], value, true, true)
          } else {
            config[prop] = value
          }
        })

                // Reverse map the bundles
        if (cfg.bundles) {
          eachProp(cfg.bundles, (value, prop) => {
            each(value, (v) => {
              if (v !== prop) {
                bundlesMap[v] = prop
              }
            })
          })
        }

                // Merge shim
        if (cfg.shim) {
          eachProp(cfg.shim, (value, id) => {
                        // Normalize the structure
            if (isArray(value)) {
              value = {
                deps: value,
              }
            }
            if ((value.exports || value.init) && !value.exportsFn) {
              value.exportsFn = context.makeShimExports(value)
            }
            shim[id] = value
          })
          config.shim = shim
        }

                // Adjust packages if necessary.
        if (cfg.packages) {
          each(cfg.packages, (pkgObj) => {
            let location,
              name

            pkgObj = typeof pkgObj === 'string' ? { name: pkgObj } : pkgObj

            name = pkgObj.name
            location = pkgObj.location
            if (location) {
              config.paths[name] = pkgObj.location
            }

                        // Save pointer to main module ID for pkg name.
                        // Remove leading dot in main, so main paths are normalized,
                        // and remove any trailing .js, since different package
                        // envs have different conventions: some use a module name,
                        // some use a file name.
            config.pkgs[name] = `${pkgObj.name}/${(pkgObj.main || 'main')
                                     .replace(currDirRegExp, '')
                                     .replace(jsSuffixRegExp, '')}`
          })
        }

                // If there are any "waiting to execute" modules in the registry,
                // update the maps for them, since their info, like URLs to load,
                // may have changed.
        eachProp(registry, (mod, id) => {
                    // If module already has init called, since it is too
                    // late to modify them, and ignore unnormalized ones
                    // since they are transient.
          if (!mod.inited && !mod.map.unnormalized) {
            mod.map = makeModuleMap(id, null, true)
          }
        })

                // If a deps array or a config callback is specified, then call
                // require with those args. This is useful when require is defined as a
                // config object before require.js is loaded.
        if (cfg.deps || cfg.callback) {
          context.require(cfg.deps || [], cfg.callback)
        }
      },

      makeShimExports(value) {
        function fn() {
          let ret
          if (value.init) {
            ret = value.init.apply(global, arguments)
          }
          return ret || (value.exports && getGlobal(value.exports))
        }
        return fn
      },

      makeRequire(relMap, options) {
        options = options || {}

        function localRequire(deps, callback, errback) {
          let id,
            map,
            requireMod

          if (options.enableBuildCallback && callback && isFunction(callback)) {
            callback.__requireJsBuild = true
          }

          if (typeof deps === 'string') {
            if (isFunction(callback)) {
                            // Invalid call
              return onError(makeError('requireargs', 'Invalid require call'), errback)
            }

                        // If require|exports|module are requested, get the
                        // value for them from the special handlers. Caveat:
                        // this only works while module is being defined.
            if (relMap && hasProp(handlers, deps)) {
              return handlers[deps](registry[relMap.id])
            }

                        // Synchronous access to one module. If require.get is
                        // available (as in the Node adapter), prefer that.
            if (req.get) {
              return req.get(context, deps, relMap, localRequire)
            }

                        // Normalize module name, if it contains . or ..
            map = makeModuleMap(deps, relMap, false, true)
            id = map.id

            if (!hasProp(defined, id)) {
              return onError(makeError('notloaded', `Module name "${
                                        id
                                        }" has not been loaded yet for context: ${
                                        contextName
                                        }${relMap ? '' : '. Use require([])'}`))
            }
            return defined[id]
          }

                    // Grab defines waiting in the global queue.
          intakeDefines()

                    // Mark all the dependencies as needing to be loaded.
          context.nextTick(() => {
                        // Some defines could have been added since the
                        // require call, collect them.
            intakeDefines()

            requireMod = getModule(makeModuleMap(null, relMap))

                        // Store if map config should be applied to this require
                        // call for dependencies.
            requireMod.skipMap = options.skipMap

            requireMod.init(deps, callback, errback, {
              enabled: true,
            })

            checkLoaded()
          })

          return localRequire
        }

        mixin(localRequire, {
          isBrowser,

                    /**
                     * Converts a module name + .extension into an URL path.
                     * *Requires* the use of a module name. It does not support using
                     * plain URLs like nameToUrl.
                     */
          toUrl(moduleNamePlusExt) {
            let ext,
              index = moduleNamePlusExt.lastIndexOf('.'),
              segment = moduleNamePlusExt.split('/')[0],
              isRelative = segment === '.' || segment === '..'

                        // Have a file extension alias, and it is not the
                        // dots from a relative path.
            if (index !== -1 && (!isRelative || index > 1)) {
              ext = moduleNamePlusExt.substring(index, moduleNamePlusExt.length)
              moduleNamePlusExt = moduleNamePlusExt.substring(0, index)
            }

            return context.nameToUrl(normalize(moduleNamePlusExt,
                                                relMap && relMap.id, true), ext, true)
          },

          defined(id) {
            return hasProp(defined, makeModuleMap(id, relMap, false, true).id)
          },

          specified(id) {
            id = makeModuleMap(id, relMap, false, true).id
            return hasProp(defined, id) || hasProp(registry, id)
          },
        })

                // Only allow undef on top level require calls
        if (!relMap) {
          localRequire.undef = function (id) {
                        // Bind any waiting define() calls to this context,
                        // fix for #408
            takeGlobalQueue()

            let map = makeModuleMap(id, relMap, true),
              mod = getOwn(registry, id)

            mod.undefed = true
            removeScript(id)

            delete defined[id]
            delete urlFetched[map.url]
            delete undefEvents[id]

                        // Clean queued defines too. Go backwards
                        // in array so that the splices do not
                        // mess up the iteration.
            eachReverse(defQueue, (args, i) => {
              if (args[0] === id) {
                defQueue.splice(i, 1)
              }
            })
            delete context.defQueueMap[id]

            if (mod) {
                            // Hold on to listeners in case the
                            // module will be attempted to be reloaded
                            // using a different config.
              if (mod.events.defined) {
                undefEvents[id] = mod.events
              }

              cleanRegistry(id)
            }
          }
        }

        return localRequire
      },

            /**
             * Called to enable a module if it is still in the registry
             * awaiting enablement. A second arg, parent, the parent module,
             * is passed in for context, when this method is overridden by
             * the optimizer. Not shown here to keep code compact.
             */
      enable(depMap) {
        const mod = getOwn(registry, depMap.id)
        if (mod) {
          getModule(depMap).enable()
        }
      },

            /**
             * Internal method used by environment adapters to complete a load event.
             * A load event could be a script load or just a load pass from a synchronous
             * load call.
             * @param {String} moduleName the name of the module to potentially complete.
             */
      completeLoad(moduleName) {
        let found,
          args,
          mod,
          shim = getOwn(config.shim, moduleName) || {},
          shExports = shim.exports

        takeGlobalQueue()

        while (defQueue.length) {
          args = defQueue.shift()
          if (args[0] === null) {
            args[0] = moduleName
                        // If already found an anonymous module and bound it
                        // to this name, then this is some other anon module
                        // waiting for its completeLoad to fire.
            if (found) {
              break
            }
            found = true
          } else if (args[0] === moduleName) {
                        // Found matching define call for this script!
            found = true
          }

          callGetModule(args)
        }
        context.defQueueMap = {}

                // Do this after the cycle of callGetModule in case the result
                // of those calls/init calls changes the registry.
        mod = getOwn(registry, moduleName)

        if (!found && !hasProp(defined, moduleName) && mod && !mod.inited) {
          if (config.enforceDefine && (!shExports || !getGlobal(shExports))) {
            if (hasPathFallback(moduleName)) {
              return
            } else {
              return onError(makeError('nodefine',
                                             `No define call for ${moduleName}`,
                                             null,
                                             [moduleName]))
            }
          } else {
                        // A script that does not call define(), so just simulate
                        // the call for it.
            callGetModule([moduleName, (shim.deps || []), shim.exportsFn])
          }
        }

        checkLoaded()
      },

            /**
             * Converts a module name to a file path. Supports cases where
             * moduleName may actually be just an URL.
             * Note that it **does not** call normalize on the moduleName,
             * it is assumed to have already been normalized. This is an
             * internal API, not a public one. Use toUrl for the public API.
             */
      nameToUrl(moduleName, ext, skipExt) {
        let paths,
          syms,
          i,
          parentModule,
          url,
          parentPath,
          bundleId,
          pkgMain = getOwn(config.pkgs, moduleName)

        if (pkgMain) {
          moduleName = pkgMain
        }

        bundleId = getOwn(bundlesMap, moduleName)

        if (bundleId) {
          return context.nameToUrl(bundleId, ext, skipExt)
        }

                // If a colon is in the URL, it indicates a protocol is used and it is just
                // an URL to a file, or if it starts with a slash, contains a query arg (i.e. ?)
                // or ends with .js, then assume the user meant to use an url and not a module id.
                // The slash is important for protocol-less URLs as well as full paths.
        if (req.jsExtRegExp.test(moduleName)) {
                    // Just a plain path, not module name lookup, so just return it.
                    // Add extension if it is included. This is a bit wonky, only non-.js things pass
                    // an extension, this method probably needs to be reworked.
          url = moduleName + (ext || '')
        } else {
                    // A module that needs to be converted to a path.
          paths = config.paths

          syms = moduleName.split('/')
                    // For each module name segment, see if there is a path
                    // registered for it. Start with most specific name
                    // and work up from it.
          for (i = syms.length; i > 0; i -= 1) {
            parentModule = syms.slice(0, i).join('/')

            parentPath = getOwn(paths, parentModule)
            if (parentPath) {
                            // If an array, it means there are a few choices,
                            // Choose the one that is desired
              if (isArray(parentPath)) {
                parentPath = parentPath[0]
              }
              syms.splice(0, i, parentPath)
              break
            }
          }

                    // Join the path parts together, then figure out if baseUrl is needed.
          url = syms.join('/')
          url += (ext || (/^data\:|^blob\:|\?/.test(url) || skipExt ? '' : '.js'))
          url = (url.charAt(0) === '/' || url.match(/^[\w\+\.\-]+:/) ? '' : config.baseUrl) + url
        }

        return config.urlArgs && !/^blob\:/.test(url) ?
                       url + config.urlArgs(moduleName, url) : url
      },

            // Delegates to req.load. Broken out as a separate function to
            // allow overriding in the optimizer.
      load(id, url) {
        req.load(context, id, url)
      },

            /**
             * Executes a module callback function. Broken out as a separate function
             * solely to allow the build system to sequence the files in the built
             * layer in the right sequence.
             *
             * @private
             */
      execCb(name, callback, args, exports) {
        return callback.apply(exports, args)
      },

            /**
             * callback for script loads, used to check status of loading.
             *
             * @param {Event} evt the event from the browser for the script
             * that was loaded.
             */
      onScriptLoad(evt) {
                // Using currentTarget instead of target for Firefox 2.0's sake. Not
                // all old browsers will be supported, but this one was easy enough
                // to support and still makes sense.
        if (evt.type === 'load' ||
                        (readyRegExp.test((evt.currentTarget || evt.srcElement).readyState))) {
                    // Reset interactive script so a script node is not held onto for
                    // to long.
          interactiveScript = null

                    // Pull out the name of the module and the context.
          const data = getScriptData(evt)
          context.completeLoad(data.id)
        }
      },

            /**
             * Callback for script errors.
             */
      onScriptError(evt) {
        const data = getScriptData(evt)
        if (!hasPathFallback(data.id)) {
          const parents = []
          eachProp(registry, (value, key) => {
            if (key.indexOf('_@r') !== 0) {
              each(value.depMaps, (depMap) => {
                if (depMap.id === data.id) {
                  parents.push(key)
                  return true
                }
              })
            }
          })
          return onError(makeError('scripterror', `Script error for "${data.id
                                             }${parents.length ?
                                             `", needed by: ${parents.join(', ')}` :
                                             '"'}`, evt, [data.id]))
        }
      },
    }

    context.require = context.makeRequire()
    return context
  }

    /**
     * Main entry point.
     *
     * If the only argument to require is a string, then the module that
     * is represented by that string is fetched for the appropriate context.
     *
     * If the first argument is an array, then it will be treated as an array
     * of dependency string names to fetch. An optional function callback can
     * be specified to execute when all of those dependencies are available.
     *
     * Make a local req variable to help Caja compliance (it assumes things
     * on a require that are not standardized), and to give a short
     * name for minification/local scope use.
     */
  req = requirejs = function (deps, callback, errback, optional) {
        // Find the right context, use default
    let context,
      config,
      contextName = defContextName

        // Determine if have config object in the call.
    if (!isArray(deps) && typeof deps !== 'string') {
            // deps is a config object
      config = deps
      if (isArray(callback)) {
                // Adjust args if there are dependencies
        deps = callback
        callback = errback
        errback = optional
      } else {
        deps = []
      }
    }

    if (config && config.context) {
      contextName = config.context
    }

    context = getOwn(contexts, contextName)
    if (!context) {
      context = contexts[contextName] = req.s.newContext(contextName)
    }

    if (config) {
      context.configure(config)
    }

    return context.require(deps, callback, errback)
  }

    /**
     * Support require.config() to make it easier to cooperate with other
     * AMD loaders on globally agreed names.
     */
  req.config = function (config) {
    return req(config)
  }

    /**
     * Execute something after the current tick
     * of the event loop. Override for other envs
     * that have a better solution than setTimeout.
     * @param  {Function} fn function to execute later.
     */
  req.nextTick = typeof setTimeout !== 'undefined' ? function (fn) {
    setTimeout(fn, 4)
  } : function (fn) { fn() }

    /**
     * Export require as a global, but only if it does not already exist.
     */
  if (!require) {
    require = req
  }

  req.version = version

    // Used to filter out dependencies that are already paths.
  req.jsExtRegExp = /^\/|:|\?|\.js$/
  req.isBrowser = isBrowser
  s = req.s = {
    contexts,
    newContext,
  }

    // Create default context.
  req({})

    // Exports some context-sensitive methods on global require.
  each([
    'toUrl',
    'undef',
    'defined',
    'specified',
  ], (prop) => {
        // Reference from contexts instead of early binding to default context,
        // so that during builds, the latest instance of the default context
        // with its config gets used.
    req[prop] = function () {
      const ctx = contexts[defContextName]
      return ctx.require[prop].apply(ctx, arguments)
    }
  })

  if (isBrowser) {
    head = s.head = document.getElementsByTagName('head')[0]
        // If BASE tag is in play, using appendChild is a problem for IE6.
        // When that browser dies, this can be removed. Details in this jQuery bug:
        // http://dev.jquery.com/ticket/2709
    baseElement = document.getElementsByTagName('base')[0]
    if (baseElement) {
      head = s.head = baseElement.parentNode
    }
  }

    /**
     * Any errors that require explicitly generates will be passed to this
     * function. Intercept/override it if you want custom error handling.
     * @param {Error} err the error object.
     */
  req.onError = defaultOnError

    /**
     * Creates the node for the load command. Only used in browser envs.
     */
  req.createNode = function (config, moduleName, url) {
    const node = config.xhtml ?
                document.createElementNS('http://www.w3.org/1999/xhtml', 'html:script') :
                document.createElement('script')
    node.type = config.scriptType || 'text/javascript'
    node.charset = 'utf-8'
    node.async = true
    return node
  }

    /**
     * Does the request to load a module for the browser case.
     * Make this a separate function to allow other environments
     * to override it.
     *
     * @param {Object} context the require context to find state.
     * @param {String} moduleName the name of the module.
     * @param {Object} url the URL to the module.
     */
  req.load = function (context, moduleName, url) {
    let config = (context && context.config) || {},
      node
    if (isBrowser) {
            // In the browser so use a script tag
      node = req.createNode(config, moduleName, url)

      node.setAttribute('data-requirecontext', context.contextName)
      node.setAttribute('data-requiremodule', moduleName)

            // Set up load listener. Test attachEvent first because IE9 has
            // a subtle issue in its addEventListener and script onload firings
            // that do not match the behavior of all other browsers with
            // addEventListener support, which fire the onload event for a
            // script right after the script execution. See:
            // https://connect.microsoft.com/IE/feedback/details/648057/script-onload-event-is-not-fired-immediately-after-script-execution
            // UNFORTUNATELY Opera implements attachEvent but does not follow the script
            // script execution mode.
      if (node.attachEvent &&
                    // Check if node.attachEvent is artificially added by custom script or
                    // natively supported by browser
                    // read https://github.com/requirejs/requirejs/issues/187
                    // if we can NOT find [native code] then it must NOT natively supported.
                    // in IE8, node.attachEvent does not have toString()
                    // Note the test for "[native code" with no closing brace, see:
                    // https://github.com/requirejs/requirejs/issues/273
                    !(node.attachEvent.toString && node.attachEvent.toString().indexOf('[native code') < 0) &&
                    !isOpera) {
                // Probably IE. IE (at least 6-8) do not fire
                // script onload right after executing the script, so
                // we cannot tie the anonymous define call to a name.
                // However, IE reports the script as being in 'interactive'
                // readyState at the time of the define call.
        useInteractive = true

        node.attachEvent('onreadystatechange', context.onScriptLoad)
                // It would be great to add an error handler here to catch
                // 404s in IE9+. However, onreadystatechange will fire before
                // the error handler, so that does not help. If addEventListener
                // is used, then IE will fire error before load, but we cannot
                // use that pathway given the connect.microsoft.com issue
                // mentioned above about not doing the 'script execute,
                // then fire the script load event listener before execute
                // next script' that other browsers do.
                // Best hope: IE10 fixes the issues,
                // and then destroys all installs of IE 6-9.
                // node.attachEvent('onerror', context.onScriptError);
      } else {
        node.addEventListener('load', context.onScriptLoad, false)
        node.addEventListener('error', context.onScriptError, false)
      }
      node.src = url

            // Calling onNodeCreated after all properties on the node have been
            // set, but before it is placed in the DOM.
      if (config.onNodeCreated) {
        config.onNodeCreated(node, config, moduleName, url)
      }

            // For some cache cases in IE 6-8, the script executes before the end
            // of the appendChild execution, so to tie an anonymous define
            // call to the module name (which is stored on the node), hold on
            // to a reference to this node, but clear after the DOM insertion.
      currentlyAddingScript = node
      if (baseElement) {
        head.insertBefore(node, baseElement)
      } else {
        head.appendChild(node)
      }
      currentlyAddingScript = null

      return node
    } else if (isWebWorker) {
      try {
                // In a web worker, use importScripts. This is not a very
                // efficient use of importScripts, importScripts will block until
                // its script is downloaded and evaluated. However, if web workers
                // are in play, the expectation is that a build has been done so
                // that only one script needs to be loaded anyway. This may need
                // to be reevaluated if other use cases become common.

                // Post a task to the event loop to work around a bug in WebKit
                // where the worker gets garbage-collected after calling
                // importScripts(): https://webkit.org/b/153317
        setTimeout(() => {}, 0)
        importScripts(url)

                // Account for anonymous modules
        context.completeLoad(moduleName)
      } catch (e) {
        context.onError(makeError('importscripts',
                                `importScripts failed for ${
                                    moduleName} at ${url}`,
                                e,
                                [moduleName]))
      }
    }
  }

  function getInteractiveScript() {
    if (interactiveScript && interactiveScript.readyState === 'interactive') {
      return interactiveScript
    }

    eachReverse(scripts(), (script) => {
      if (script.readyState === 'interactive') {
        return (interactiveScript = script)
      }
    })
    return interactiveScript
  }

    // Look for a data-main script attribute, which could also adjust the baseUrl.
  if (isBrowser && !cfg.skipDataMain) {
        // Figure out baseUrl. Get it from the script tag with require.js in it.
    eachReverse(scripts(), (script) => {
            // Set the 'head' where we can append children by
            // using the script's parent.
      if (!head) {
        head = script.parentNode
      }

            // Look for a data-main attribute to set main script for the page
            // to load. If it is there, the path to data main becomes the
            // baseUrl, if it is not already set.
      dataMain = script.getAttribute('data-main')
      if (dataMain) {
                // Preserve dataMain in case it is a path (i.e. contains '?')
        mainScript = dataMain

                // Set final baseUrl if there is not already an explicit one,
                // but only do so if the data-main value is not a loader plugin
                // module ID.
        if (!cfg.baseUrl && mainScript.indexOf('!') === -1) {
                    // Pull off the directory of data-main for use as the
                    // baseUrl.
          src = mainScript.split('/')
          mainScript = src.pop()
          subPath = src.length ? `${src.join('/')}/` : './'

          cfg.baseUrl = subPath
        }

                // Strip off any trailing .js since mainScript is now
                // like a module name.
        mainScript = mainScript.replace(jsSuffixRegExp, '')

                // If mainScript is still a path, fall back to dataMain
        if (req.jsExtRegExp.test(mainScript)) {
          mainScript = dataMain
        }

                // Put the data-main script in the files to load.
        cfg.deps = cfg.deps ? cfg.deps.concat(mainScript) : [mainScript]

        return true
      }
    })
  }

    /**
     * The function that handles definitions of modules. Differs from
     * require() in that a string for the module should be the first argument,
     * and the function to execute after dependencies are loaded should
     * return a value to define the module corresponding to the first argument's
     * name.
     */
  define = function (name, deps, callback) {
    let node,
      context

        // Allow for anonymous modules
    if (typeof name !== 'string') {
            // Adjust args appropriately
      callback = deps
      deps = name
      name = null
    }

        // This module may not have dependencies
    if (!isArray(deps)) {
      callback = deps
      deps = null
    }

        // If no name, and callback is a function, then figure out if it a
        // CommonJS thing with dependencies.
    if (!deps && isFunction(callback)) {
      deps = []
            // Remove comments from the callback string,
            // look for require calls, and pull them into the dependencies,
            // but only if there are function args.
      if (callback.length) {
        callback
                    .toString()
                    .replace(commentRegExp, commentReplace)
                    .replace(cjsRequireRegExp, (match, dep) => {
                      deps.push(dep)
                    })

                // May be a CommonJS thing even without require calls, but still
                // could use exports, and module. Avoid doing exports and module
                // work though if it just needs require.
                // REQUIRES the function to expect the CommonJS variables in the
                // order listed below.
        deps = (callback.length === 1 ? ['require'] : ['require', 'exports', 'module']).concat(deps)
      }
    }

        // If in IE 6-8 and hit an anonymous define() call, do the interactive
        // work.
    if (useInteractive) {
      node = currentlyAddingScript || getInteractiveScript()
      if (node) {
        if (!name) {
          name = node.getAttribute('data-requiremodule')
        }
        context = contexts[node.getAttribute('data-requirecontext')]
      }
    }

        // Always save off evaluating the def call until the script onload handler.
        // This allows multiple modules to be in a file without prematurely
        // tracing dependencies, and allows for anonymous module support,
        // where the module name is not known until the script onload event
        // occurs. If no context, use the global queue, and get it processed
        // in the onscript load callback.
    if (context) {
      context.defQueue.push([name, deps, callback])
      context.defQueueMap[name] = true
    } else {
      globalDefQueue.push([name, deps, callback])
    }
  }

  define.amd = {
    jQuery: true,
  }

    /**
     * Executes the text. Normally just uses eval, but can be modified
     * to use a better, environment-specific call. Only used for transpiling
     * loader plugins, not for plain JS modules.
     * @param {String} text the text to execute/evaluate.
     */
  req.exec = function (text) {
        /* jslint evil: true */
    return eval(text)
  }

    // Set up with config info.
  req(cfg)
}(this, (typeof setTimeout === 'undefined' ? undefined : setTimeout)))
